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local info = {
version = 1.002,
comment = "scintilla lpeg lexer for lua",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
local P, R, S, C, Cmt, Cp = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cmt, lpeg.Cp
local match, find = string.match, string.find
local setmetatable = setmetatable
local lexers = require("scite-context-lexer")
local patterns = lexers.patterns
local token = lexers.token
local lualexer = lexers.new("lua","scite-context-lexer-lua")
local luawhitespace = lualexer.whitespace
local stringlexer = lexers.load("scite-context-lexer-lua-longstring")
----- labellexer = lexers.load("scite-context-lexer-lua-labelstring")
local directives = { } -- communication channel
local keywords = {
"and", "break", "do", "else", "elseif", "end", "false", "for", "function", -- "goto",
"if", "in", "local", "nil", "not", "or", "repeat", "return", "then", "true",
"until", "while",
}
local functions = {
"assert", "collectgarbage", "dofile", "error", "getmetatable",
"ipairs", "load", "loadfile", "module", "next", "pairs",
"pcall", "print", "rawequal", "rawget", "rawset", "require",
"setmetatable", "tonumber", "tostring", "type", "unpack", "xpcall", "select",
"string", "table", "coroutine", "debug", "file", "io", "lpeg", "math", "os", "package", "bit32", "utf8",
}
local constants = {
"_G", "_VERSION", "_M", "...", "_ENV",
-- here too
"__add", "__call", "__concat", "__div", "__idiv", "__eq", "__gc", "__index",
"__le", "__lt", "__metatable", "__mode", "__mul", "__newindex",
"__pow", "__sub", "__tostring", "__unm", "__len",
"__pairs", "__ipairs",
"__close",
"NaN",
"<const>", "<toclose>",
}
local internals = { -- __
"add", "call", "concat", "div", "idiv", "eq", "gc", "index",
"le", "lt", "metatable", "mode", "mul", "newindex",
"pow", "sub", "tostring", "unm", "len",
"pairs", "ipairs",
"close",
}
local depricated = {
"arg", "arg.n",
"loadstring", "setfenv", "getfenv",
"pack",
}
local csnames = { -- todo: option
"commands",
"context",
-- "ctxcmd",
-- "ctx",
"metafun",
"metapost",
}
local level = nil
local setlevel = function(_,i,s) level = s return i end
local equals = P("=")^0
local longonestart = P("[[")
local longonestop = P("]]")
local longonestring = (1-longonestop)^0
local longtwostart = P("[") * Cmt(equals,setlevel) * P("[")
local longtwostop = P("]") * equals * P("]")
local sentinels = { } setmetatable(sentinels, { __index = function(t,k) local v = "]" .. k .. "]" t[k] = v return v end })
local longtwostring = P(function(input,index)
if level then
-- local sentinel = "]" .. level .. "]"
local sentinel = sentinels[level]
local _, stop = find(input,sentinel,index,true)
return stop and stop + 1 - #sentinel or #input + 1
end
end)
local longtwostring_body = longtwostring
local longtwostring_end = P(function(input,index)
if level then
-- local sentinel = "]" .. level .. "]"
local sentinel = sentinels[level]
local _, stop = find(input,sentinel,index,true)
return stop and stop + 1 or #input + 1
end
end)
local longcomment = Cmt(#("[[" + ("[" * C(equals) * "[")), function(input,index,level)
-- local sentinel = "]" .. level .. "]"
local sentinel = sentinels[level]
local _, stop = find(input,sentinel,index,true)
return stop and stop + 1 or #input + 1
end)
local space = patterns.space -- S(" \n\r\t\f\v")
local any = patterns.any
local eol = patterns.eol
local exactmatch = patterns.exactmatch
local justmatch = patterns.justmatch
local squote = P("'")
local dquote = P('"')
local escaped = P("\\") * P(1)
local dashes = P("--")
local spacing = token(luawhitespace, space^1)
local rest = token("default", any)
local shortcomment = token("comment", dashes * (1-eol)^0)
local longcomment = token("comment", dashes * longcomment)
-- fails on very long string with \ at end of lines (needs embedded lexer)
-- and also on newline before " but it makes no sense to waste time on it
local shortstring = token("quote", dquote)
* token("string", (escaped + (1-dquote))^0)
* token("quote", dquote)
+ token("quote", squote)
* token("string", (escaped + (1-squote))^0)
* token("quote", squote)
----- longstring = token("quote", longonestart)
----- * token("string", longonestring)
----- * token("quote", longonestop)
----- + token("quote", longtwostart)
----- * token("string", longtwostring)
----- * token("quote", longtwostop)
local string = shortstring
----- + longstring
lexers.embed(lualexer, stringlexer, token("quote",longtwostart), token("string",longtwostring_body) * token("quote",longtwostring_end))
local integer = P("-")^-1 * (patterns.hexadecimal + patterns.decimal)
local number = token("number", patterns.float + integer)
* (token("error",R("AZ","az","__")^1))^0
-- officially 127-255 are ok but not utf so useless
----- validword = R("AZ","az","__") * R("AZ","az","__","09")^0
local utf8character = P(1) * R("\128\191")^1
local validword = (R("AZ","az","__") + utf8character) * (R("AZ","az","__","09") + utf8character)^0
local validsuffix = (R("AZ","az") + utf8character) * (R("AZ","az","__","09") + utf8character)^0
local identifier = token("default",validword)
----- operator = token("special", P('..') + P('~=') + S('+-*/%^#=<>;:,.{}[]()')) -- maybe split off {}[]()
----- operator = token("special", S('+-*/%^#=<>;:,{}[]()') + P('..') + P('.') + P('~=') ) -- maybe split off {}[]()
----- operator = token("special", S('+-*/%^#=<>;:,{}[]().') + P('~=') ) -- no ^1 because of nested lexers
local operator = token("special", S('+-*/%^#=<>;:,{}[]().|~')) -- no ^1 because of nested lexers
local optionalspace = spacing^0
local hasargument = #S("{([")
-- ideal should be an embedded lexer ..
local gotokeyword = token("keyword", P("goto"))
* spacing
* token("grouping",validword)
local gotolabel = token("keyword", P("::"))
* (spacing + shortcomment)^0
* token("grouping",validword)
* (spacing + shortcomment)^0
* token("keyword", P("::"))
local p_keywords = exactmatch(keywords)
local p_functions = exactmatch(functions)
local p_constants = exactmatch(constants)
local p_internals = P("__")
* exactmatch(internals)
local p_finish = #(1-R("az","AZ","__"))
local p_csnames = justmatch(csnames)
local p_ctnames = P("ctx") * R("AZ","az","__")^0
local keyword = token("keyword", p_keywords)
local builtin = token("plain", p_functions)
local constant = token("data", p_constants)
local internal = token("data", p_internals)
local csname = token("user", p_csnames + p_ctnames)
* p_finish * optionalspace * (
hasargument
+ ( token("special", S(".:")) * optionalspace * token("user", validword) )^1
)^-1
-- we could also check S(".:") * p_keyword etc, could be faster
local identifier = token("default", validword)
* ( optionalspace * token("special", S(".:")) * optionalspace * (
token("warning", p_keywords) +
token("data", p_internals) + -- needs checking
token("default", validword )
) )^0
lualexer.rules = {
{ "whitespace", spacing },
{ "keyword", keyword }, -- can be combined
{ "function", builtin }, -- can be combined
{ "constant", constant }, -- can be combined
{ "csname", csname },
{ "goto", gotokeyword },
{ "identifier", identifier },
{ "string", string },
{ "number", number },
{ "longcomment", longcomment },
{ "shortcomment", shortcomment },
{ "label", gotolabel },
{ "operator", operator },
{ "rest", rest },
}
lualexer.folding = {
-- challenge: if=0 then=1 else=-1 elseif=-1
["if"] = { ["keyword"] = 1 }, -- if .. [then|else] .. end
["do"] = { ["keyword"] = 1 }, -- [while] do .. end
["function"] = { ["keyword"] = 1 }, -- function .. end
["repeat"] = { ["keyword"] = 1 }, -- repeat .. until
["until"] = { ["keyword"] = -1 },
["end"] = { ["keyword"] = -1 },
-- ["else"] = { ["keyword"] = 1 },
-- ["elseif"] = { ["keyword"] = 1 }, -- already catched by if
-- ["elseif"] = { ["keyword"] = 0 },
["["] = {
["comment"] = 1,
-- ["quote"] = 1, -- confusing
},
["]"] = {
["comment"] = -1
-- ["quote"] = -1, -- confusing
},
-- ["("] = { ["special"] = 1 },
-- [")"] = { ["special"] = -1 },
["{"] = { ["special"] = 1 },
["}"] = { ["special"] = -1 },
}
-- embedded in tex:
local cstoken = R("az","AZ","\127\255") + S("@!?_")
local texcsname = P("\\") * cstoken^1
local commentline = P("%") * (1-S("\n\r"))^0
local texcomment = token("comment", Cmt(commentline, function() return directives.cld_inline end))
local longthreestart = P("\\!!bs")
local longthreestop = P("\\!!es")
local longthreestring = (1-longthreestop)^0
local texstring = token("quote", longthreestart)
* token("string", longthreestring)
* token("quote", longthreestop)
local texcommand = token("warning", texcsname)
lualexer.directives = directives
lualexer.rules_cld = {
{ "whitespace", spacing },
{ "texstring", texstring },
{ "texcomment", texcomment },
{ "texcommand", texcommand },
{ "keyword", keyword },
{ "function", builtin },
{ "csname", csname },
{ "goto", gotokeyword },
{ "constant", constant },
{ "identifier", identifier },
{ "string", string },
{ "longcomment", longcomment },
{ "shortcomment", shortcomment }, -- should not be used inline so best signal it as comment (otherwise complex state till end of inline)
{ "number", number },
{ "label", gotolabel },
{ "operator", operator },
{ "rest", rest },
}
return lualexer
|
